Make use of Discover, Examine, Create on top level

[ghost]

We just discussed:

• Discover
• Examine -- Check -- Inspect -- Manipilate -- Substitute
• Create

as top level interactions and hence items for the spec.

Tasks for dev branch:

• [x] add terms to glossary
• [x] use check instead of validate in spec
• [x] replace "validation" with "bag validation" whenever this is meant, to avoid confusion

[nuest]

https://github.com/o2r-project/o2r-platform/issues/92

[nuest]

Completed in https://github.com/o2r-project/erc-spec/tree/post-workshop2017-update